Examine source code of Just 5 Minutes

{
  "manifest_version": 2,
  "name": "Just 5 Minutes",
  "version": "1.0.0",
  "description": "Gives you a short allowance on distracting feeds, then locks scrolling for the rest of the session.",
  "permissions": [
    "storage",
    "tabs",
    "notifications",
    "*://*.facebook.com/*",
    "*://*.instagram.com/*",
    "*://*.reddit.com/*",
    "*://*.tiktok.com/*",
    "*://*.twitter.com/*",
    "*://*.x.com/*",
    "*://*.youtube.com/*"
  ],
  "browser_action": {
    "default_title": "Just 5 Minutes",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/icon.svg"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "just-5-minutes@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*",
        "*://*.instagram.com/*",
        "*://*.reddit.com/*",
        "*://*.tiktok.com/*",
        "*://*.twitter.com/*",
        "*://*.x.com/*",
        "*://*.youtube.com/*"
      ],
      "js": [
        "content/block-wheel.js"
      ],
      "run_at": "document_start"
    }
  ]
}